I know it sounds strange but there is a BIOS upgrade that will fix this. I have had an aspire 1 since it first came out and last Friday, I bought a 6-cell battery and it wouldn't take a charge. Acer sent me this:
"Please visit
http://helpdesk.acer.com.au/aspire and click -download- and follow on screen steps.Before clicking on download, please ensure you read the detailed step by simply clicking on the -instructions- button found next to -download-"
Actually, to get to 'Download' you have to Register but that shouldn't be a problem.It fixed my problem. HTH. Charles